Crushing and grinding mill



Sept. 26, 1939. w. M. MCKEEVER CRUSHING AND GRINDING MILL Filed Sept. 6,1938 ll/l/l/Illl Z/Z'ZZZZZW M/Wc 252 192; 0/".

INVENTOR ATTORNEYS Patented Sept. 26, 1939 UNITED STATES PATENT OFFICE 1Claim.

This invention relates to crushing and grinding mills, and its generalobject is to provide a mill for pulverizing ore, rock and the like, thatis capable of maximum production with minimum use of power, due to asimultaneous reciprocatory crushing and rotary grinding action, coupledwith means to provide a continuous flow of material through the mill,which results in eliminating what may be termed clod resistance and overgrind waste, and as both of those detrimental features are present inmills of this character now in general use, such mills require a greateroperating power and expense, with less production than the mill whichforms the subject matter of the present invention.

A further object is to provide a mill that includes companion crushingand grinding elements, or in other words a mortar and muller therefor,that are detachably mounted, so that they may be readily replaced in theevent of damage thereto.

A still further object is to provide a grinding and crushing mill thatis simple in construction, inexpensive to manufacture, easy to install,and extremely efficient in operation, use and service.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to theaccompanying drawing wherein like characters denote like orcorresponding parts throughout the several views, and in which:

Figure 1 is a vertical sectional View taken through the mill which formsthe subject matter of the present invention, and illustrates one form ofreciprocating means for the muller.

Figure 2 is a sectional view taken approximately on line 2-2 of Figure1, looking in the direction of the arrows.

Figure 3 is a view of a modified form of reciprocating and drive meansfor the muller.

Referring to the drawing in detail, the reference numeral l indicatesthe mortar of my mill which is preferably of flat cylindrical formation,as shown, and in any event is provided with a plurality of recessesextending into the bottom thereof to fittingly receive mounting studs 2,the latter being fixed in and rising from a base not shown, which ispreferably concrete, but of course the base can be of any materialsuitable for the purpose.

Surrounding the mortar and secured thereto, as well as rising aconsiderable distance above the upper surface thereof is a drum 3 thatacts as a receptacle for receiving rock, ore or the like, and the mortarhas a conical cavity in the upper face thereof, that extends from itsouter edge toward its center, it being obvious that the upper faceprovides a working surface, and an opening 4 in the form of a boreextends through the center to provide outlet means, as will be apparentupon inspection of Figure 1.

The muller includes a body or shoe 5 having a conical lower working facefor fitting association with the working face of the mortar and the body5 is of less diameter than the mortar, but likewise has surrounding thesame and secured thereto, as well as rising therefrom a drum 6, whichextends above the upper end of the drum 3, and the drums cooperate toprovide a feeding space between the same. 0

The muller has a shaft 1 detachably connected thereto, through theinstrumentality of a spider 8 that includes arms 9 provided withopenings in the ends thereof to receive bolts of bolt and nutconnections ill, the bolts having their heads mounted in bayonet slots Il disposed in the body or shoe 5 and held accordingly by Babbitt metal12. The reduced portions of the slots l l are preferably wedge shape asshown in Figure 1, while the remaining portions are rounded and are of asize to allow free insertion and removal of the heads with respect tothe slots, as will be apparent upon inspection of Figures 1 and 2. Theshaft 1 is provided with a head l3 received in a recess in the lowersurface of the spider which is centrally enlarged, and has the arms 9connected to the centrally enlarged portion by webs, as best shown inFigure 2.

In Figure 1 I have illustrated one form of reciprocating means for themuller which includes a bushing guide 14 for the shaft I mounted insuitable supporting means [5 and the bushing has formed thereon a diskmember' 16 having bearing members ll rising therefrom to receive thetrunnions of rollers l8, upon which are mounted cam members IQ of a diskplate 20 that is fixed to the shaft 1. By that construction, it will beobvious that the muller is reciprocated during the rotation thereof, andthe shaft 1 has connected thereto any suitable power means, for rotatingthe same.

In Figure 3, I have illustrated a combined r0- tary drive andreciprocating means for the shaft of the muller, and which in thisinstance is indicated by the reference numeral 2|, the shaft 55 beingmounted in the bushing 22 that is likewise provided with suitablesupporting means 23, and the shaft includes a square cornered portion 24for slidable movement through a beveled gear 25 which is held seated onthe bushing 22 by a companion gear 26, in that the gear 26 is fixed tothe drive shaft 27 which is journaled in the bracket 28 secured to andrising from the supporting means 23.

Floating or rotatably mounted on the upper end portion of the shaft 2|,is an abutment disk 29 that is held thereon accordingly between collars30 and 3|, by lock nuts 32, for disposal in the path of an accentric cammember 33 which is fixed on the end of the drive shaft 25, consequentlyit will be obvious that the shaft 2| is not only rotated through theinstrumentality of the bevel gears 25 and 26, but is reciprocated by thecam member 33 and abutment disk 29. The shaft 2| is also provided with ahead 34, for receiving the muller in the same manner, as shown in Figure1.

In order to supply material to the mill, to be ground thereby I providea trough 35 that is preferably of the channel type, as best shown inFigure 2, and rests upon the upper edge of the drum 3 for directing thematerial between the drums, as will be obvious upon inspection of Figure1, so that the material will fall by gravity upon the conical workingsurface of the mortar and thence be disposed between that face and theworking face of the muller, to be crushed and ground, as it is being fedto the outlet opening 4. It will be further obvious'that the base isprovided with outlet means to register with the opening 4. By providingthe outlet opening in the center of the mortar, it will be seen that thepulverized material will freely pass from the mill, and that featurecoupled with the simultaneous reciprocatory and rotary action of themuller will eliminate the so-called clod resistance, as well as overgrind waste as previously set forth, and thereby bring about maximumproduction with the use of minimum power.

While it has been stated that any suitable power means may be employedfor rotating the shaft 1, for cooperation with the reciprocating meansof Figure 1, it will be obvious that the gear means of Figure 3 and thedrive shaft 2'! may be used for that purpose.

It is thought from the foregoing description that the advantages andnovel features of the invention will be readily apparent.

It isto be understood that changes may be made in the construction andin the combination and arrangement of the several parts, provided thatsuch changes fall within the scope of the appended claim.

What I claim is:

A mill comprising a mortar having an outlet opening extending centrallytherethrough, a muller mounted for rotary and reciprocatory movementswith respect to the mortar for cooperation therewith, a mortar engagingshoe included in the muller and having bayonet slots therein, a spiderincluded in the muller and having arms, bolt and nut connections forsecuring the shoe to the arms, soft metallic means for securing thebolts of the bolt and nut connections in the bayonet slots, a shaft forthe muller and detachably connected thereto by the spider, drums securedto and surrounding the mortar and muller and rising vertically therefromin spaced relation with respect to each other to provide an annularfeeding space therebetween, and means for rotating and reciprocating themuller.

WILLIAM M. MCKEEVER.

